ddns dyndns
checkip.dyndns.org和members.dyndns.org无法连接，需要更改为checkip.dyndns.com和members.dyndns.com；
下载http://download.csdn.net/download/zhaowen_cug/10159748，编译inadyn_1.96.2，
使用inadyn -u xxx -p xxx -a xxx.dyndns.org --verbose 5测试;
inadyn -u 用户名 -p 明文密码 -a xxxx.dyndns.org --dyndns_system default@dyndns.org --ip_server_name checkip.dyndns.com:8245 / --dyndns_server_name members.dyndns.org:80 --dyndns_server_url /nic/update? --verbose 5
dyndns.com服务器在美国，大陆连接过去tcp reset，亲测在泰国当地测试可以正常使用；
Request:
GET http://checkip.dyndns.com:80/ HTTP/1.0
response:
HTTP/1.1 200 OK
Content-Type: text/html
Server: DynDNS-CheckIP/1.0.1
Connection: close
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 105
<html><head><title>Current IP Check</title></head><body>Current IP Address: 61.183.207.98</body></html>
Request:
GET http://members.dyndns.com:80/nic/update?hostname=truetest.dyndns.org&myip=61.183.207.98 HTTP/1.0
Host: members.dyndns.com
Authorization: Basic ZnJpZGF5MDIyOldpbjUyMTcyMzYw
User-Agent: inadyn/1.96.2
checkip可更改为：
checkip.dyndns.com
checkip.dyndns.com:8245
whatismyip.org
myip.dnsomatic.com
checkip.dyndns.com
www.checkip.org
checkip.dyndns.com
www.checkip.org
www.whatismyip.com
www.ip-adress.com
checkip.synology.com
myip.dnsomatic.com
checkip.amazonaws.com
troglobit.com/project/inadyn